| retarded dentition | Dentition in which growth phenomena such as calcification, elongation, and eruption occur later than in the average range of normal variation as a result of some systemic metabolic dysfunction (e.g., hypothyroidism). (05 Mar 2000) |
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| retrograde ejaculation | <urology> Ejaculation backwards into the bladder instead of forward through the urethra. (11 Jan 1998) |
| education of mentally retarded | The teaching or training of those individuals with subnormal intellectual functioning. (12 Dec 1998) |
| ejaculation | A sudden act of expulsion, as of the semen. Origin: L. Ejaculation (18 Nov 1997) |